making it more resistant to cavity-causing acids. But rinsing with water washes away some of that beneficial fluoride.

     Many people rinse with water after brushing, but dentists recommend skipping this step. Fluoride in toothpaste strengthens teeth, and rinsing washes it away. Instead, spit and wait 15 minutes before rinsing or drinking water to maximize fluoride’s effect. This is especially helpful for those prone to cavities. Mouthwash should also not be used right after brushing, for the same reason. […]